I believe I misspoke
Tracking the comments following my remark, it struck me that I've probably misinterpreted the ' 14-21' to have indicated ' 14-mpg CITY and 21-mpg HWY, not an improvement of 14-mpg HWY, to 21-mpg HWY attributed exclusively to the 'aeroshell' shown.
There's never been any CFD or empirical wind tunnel measurements published to my knowledge, which associate such a remarkable mpg increase with the addition of such a bedcover.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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